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SOLAR/1010-79/02 

Monthly 

Performance 

Report 



A-FRAME 
FEBRUARY 1979 







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■ 







U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 
A-FRAME INDUSTRIES 
FEBRUARY 1979 

I. SYSTEM DESCRIPTION 

The A-Frame Industries site is a single- family residence in Kaneohe, Hawaii. 
Solar energy is used for heating domestic hot water (DHW). The solar energy 
system has an array of flat-plate collectors with a gross area of 77 square 
feet. The array faces 10 degrees east of south at an angle of 21 degrees to 
the horizontal. Potable water is the transfer medium that delivers solar 
energy from the collector array to storage and to the DHW load. Solar heated 
water is stored in a 120-gallon DHW tank. The tank has no freeze protection. 
Unheated city water is fed directly to the DHW storage tank and supplied, on 
demand, to the DHW load. When solar energy is insufficient to satisfy the 
DHW load, an electrical heating element in the storage tank provides auxiliary 
energy for water heating. The system, shown schematically in Figure 1, has 
only one mode of solar operation. 

Mode 1 - Collector-to-Storage : This mode activates when the temperature of 
the outlet of the collector exceeds that of the storage tank by 5°F. Water 
then circulates through the collectors until the temperature difference is 
2°F or less. 

II. PERFORMANCE EVALUATION 

INTRODUCTION 

The site was occupied during the month of February and the solar energy 
system operated continuously throughout the month. Solar energy satisfied 83 
percent of the DHW requirements. The solar energy system provided electrical 
energy savings of 0.47 million Btu. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
2.1 million Btu for a daily average of 957 Btu per square foot. This was 
below the estimated average daily solar radiation for this geographical area 
during February of 1605 Btu per square foot for a plane facing 10 degrees 
east of south with a tilt of 21 degrees to the horizontal. The average 
ambient temperature during February was 70°F as compared with the long-term 
average for February of 72°F. 



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THERMAL PERFORMANCE 

System - During February the solar energy system performed as expected. The 
expected performance was determined from a modified f-chart analysis using 
measured weather and subsystem loads as inputs. Solar energy collected was 
0.53 million Btu versus an estimated 0.53 million Btu. Solar energy used by 
the system was estimated by assuming that all energy collected would be 
applied to the load. Actual solar energy used was 0.52 million Btu. System 
total solar fraction was 62 percent versus an estimated 63 percent. 

Collector - The total incident solar radiation on the collector array for the 
month of February was 2.1 million Btu. During the period the collector loop 
was operating, the total insolation amounted to 1.7 million Btu. The total 
collected solar energy for the month of February was 0.53 million Btu, result- 
ing in a collector array efficiency of 26 percent, based on total incident 
insolation. Solar energy delivered from the collector array to the DHW sub- 
system was 0.52 million Btu. Energy loss during transfer from the collector 
array to the DHW subsystem was 0.014 million Btu. This loss represented 3 
percent of the energy collected. Operating energy required by the co 1 " -tor 
loop was 0.052 million Btu. 

DHW Load - The DHW subsystem consumed 0.52 million Btu of solar energy and 
0.32 million Btu of auxiliary electrical energy to satisfy a hot water load 
of 0.55 million Btu. The solar fraction of this load was 62 percent. Losses 
from the DHW subsystem were 0.29 million Btu. The DHW subsystem consumed no 
operating energy, resulting in an electrical energy savings of 0.52 million 
Btu. A daily average of 51 gallons of DHW was consumed at an average tempera- 
ture of 116°F delivered from the tank. 



OBSERVATIONS 

Moderate and intermittent data losses continued during February. 

ENERGY SAVINGS 

The solar energy system provided a net electrical energy savings of 0.47 
million Btu. The DHW subsystem provided an electrical energy savings of 0.52 
million Btu. 

III. ACTION STATUS 

IBM/Boeing will visit the site to resolve the data transmission problem. 



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